Home > CA > Contra Costa County > Diablo > Zip 94528

Zip Code 94528 — Diablo, CA

ZIP Code 94528 is associated with Diablo, CA, in Contra Costa County. The listed population estimate is 1,049; estimated density is 351.0 people per square mile. Among records with population estimates, it ranks #39 of 43 in Contra Costa County and #1410 of 1,762 in CA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (37.841490, -121.958190)

Data MetricLocal Statistic
Postal / Zip Code94528
Primary CityDiablo
State / ProvinceCA
CountyContra Costa
Total Population1,049
Population Density351.0 people/sq mi
TimezoneAmerica/Los_Angeles

How 94528 Compares

MetricZIP 94528Contra Costa County recordsCA records
Population estimate1,0491,171,369 (sum)39,286,245 (sum)
Population Density351.0 /sq mi----
County population rank#39 of 43----
State population rank#1410 of 1,762----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in CA

ZIP CodeCityDistancePopulation estimate
ZIP 94526Danville2.3 mi32,584
ZIP 94507Alamo2.8 mi14,586
ZIP 94506Danville3.7 mi27,055
ZIP 94598Walnut Creek3.8 mi27,206
ZIP 94583San Ramon5.1 mi39,583

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →